Heavy Duty Load Capacity: Industrial casters with thickened steel brackets and sealed double ball bearing design, each casters set of 4 can support load 4500 lbs and are designed for strength and durability under high stress, ideal for warehouse, factory and shop floor use Rust and Corrosion Resistant: These heavy duty casters set of 4 feature a premium anti-corrosion coating and protective dust cover that resists rust and corrosion, ensuring long-lasting performance in both indoor and outdoor environments and extending the life of the caster Smooth and Silent Movement: These 6 inch caster wheels are made of durable polyurethane material that provides smooth, quiet movement, is abrasion-resistant and won't scratch floors, even under heavy loads.They are lighter than metal wheels, reducing the burden on operators Versatile Use: These swivel casters are fantastic wheels for many applications like industrial equipment, workbench, panel trucks, drywall cart, dollies cart, tool boxes, plat-form trucks, large furniture. Our heavy duty quality casters are suitable for most industrial and commercial equipment Quality Assurane: Thank you very much for choosing Humagineer's heavy duty caster wheels, if you encounter any problems with installation, accessories or product quality, please let us know and we will be happy to serve you! Durable 4-Pack Industrial Casters: 6 Inch heavy-duty casters with reinforced steel frames and dual ball bearings, designed to support loads up to 4500 pounds. Built for long-term use in demanding environments like warehouses, workshops, and garages. Key Features: ◆ Corrosion-Resistant Design Zinc-coated steel brackets and rust-proof components withstand humidity, spills, or outdoor exposure. ◆ Quiet Rolling & Floor Protection Thickened PU wheels with non-marking treads minimize noise during movement and prevent floor scratches. ◆ Reduced Maintenance Sealed dust covers protect internal bearings from debris, while smooth-rolling construction requires no lubrication.